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3 years ago

12

A,b and c form a triangle where BAC= 90 degrees, AB= 13mm and CA= 9.7mm. Find length of BC

1 answer:

kkurt [141]3 years ago

6 0

Answer:

7.2mm

Step-by-step explanation:

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4x^2 = 92 + 7x solve the equation using the guadratic formula, show all work

katovenus [111]

$4x^2=92+7x\ \ \ \ |-4x^2\\\\-4x^2+7x+92=0\\\\a=-4;\ b=7;\ c=92\\\\b^2-4ac=7^2-4\cdot(-4)\cdot92=49+1472=1521\\\\\sqrt{b^2-4ac}=\sqrt{1521}=39\\\\x_1=\dfrac{-b-\sqrt{b^2-4ac}}{2a};\ x_2=\dfrac{-b+\sqrt{b^2-4ac}}{2a}\\\\x_1=\dfrac{-7-39}{2\cdot(-4)}=\dfrac{-46}{-8}=\dfrac{23}{4}\\\\x_2=\dfrac{-7+39}{2\cdot(-4)}=\dfrac{32}{-8}=-4$

$\text{Answer:}\ A.\ \left\{\dfrac{23}{4};\ -4\right\}$

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4 years ago

Determine the slope given the following information:

Brrunno [24]

Answer

4/1

Explanation step by step

4-(-4)/2-0

8/2

4/1

8 0

3 years ago

Factor this expression plz ...<br> 14r - 8

grandymaker [24]

Answer:

2 ( 7r - 4 )

Step-by-step explanation:

14r - 8

To factor this expression, you must pull the factor 2 outside the expression by basically reversing the distributive property:

14r - 8 = 2 ( 7r - 4 )

7 0

3 years ago

Two sides of a right triangle measure 7 units and 3 units.

weeeeeb [17]

Answer:

20 units squared

Step-by-step explanation:

Use pythagorean theorem to find third side of triangle

${2}^{2} + 4 {}^{2} = {x}^{2}$

$4 + 16 = {20}$

Take the sqr root of 20

$\sqrt{20}$

So the side of the square is sqr root of 20

Area is length x width

The area of a square is 2 times s, where s is the length of one side since a square sides are all equal.

So

$\sqrt{20} \times \sqrt{20 } = 20$

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3 years ago

Ms. Katz paid $50 for a used bicycle and then sold it to her neighbor for $60. She decided to buy it back, but she had to pay $7

Natasha2012 [34]

-50 + 60
= 10
10 - 70
= -60
-60 + 80
20
so he made a profit of $20

4 0

4 years ago

Read 2 more answers